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Solution Phosphorus Concentration and Growth of Rice (Oryza sativa L.) in Flooded Soils¹

ABSTRACT

Soil solution P concentration was monitored at weekly intervals during the vegetative growth of Rice (Oryza sativa L. var. ‘Bluebelle’) on flooded soils from the gulf coast region of Texas. Significant increases in dry matter production were obtained from application of phosphate fertilizer. Average soil solution P concentration ranged from 0.02 to 5.28 ppm when all soils and P fertilization rates were considered. A linear relationship was obtained between the logarithm of the average soil solution P concentration and the P concentration or P uptake of the plant. Yields were greater than 90% of maximum when the average soil solution P concentration was greater than 0.1 ppm. The concentration of P in the plant tissue at 0.1 ppm soil solution P was 0.25%.

¹ Contribution from the Soil and Crop Sciences Dep., Texas Agr. Exp. Sta., College Station, Texas 77843.

² Associate Professor and Graduate Research Assistants, respectively.

Received for publication November 10, 1972. Accepted for publication December 11, 1972.